Laser engraving process for chemical milling is an important way of aircraft skin machining

but there is still a lack of measurement method. To solve this problem

an on-machine accuracy measurement method for chemical milling engraving lines based on laser profiler was proposed. Firstly

the kinematics model of the five-axis laser engraving machine and laser profiler was established based on coordinate transformation. The transformation between the laser measuring coordinate system and the workpiece coordinate system was determined

based on which the scanning point cloud was obtained. Then

the profile features of single frame groove section were extracted based on template matching. The width

depth and position of the groove line were solved by Levenberg-Marquardt algorithm. The contour error of laser engraving was obtained by point cloud segmentation

contour matching and contour error calculation. Finally

the effectiveness of the proposed method was verified by laser engraving on-machine accuracy test. The results show that this method can evaluate the uniformity and profile accuracy of the profile

which provides a reference for tracing the machining error

modifying the machining process and improving the contour accuracy of the engraving line.